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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period     $ 304,506  
Balance at end of period $ 303,267   303,267  
Currency Translation        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (182,961) $ (172,459) (172,843) $ (172,434)
Other comprehensive income (loss) 4,364 1,720 (5,754) 1,695
Balance at end of period (178,597) (170,739) (178,597) (170,739)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (77,214) (74,458) (78,257) (75,286)
Other comprehensive income (loss) 1,031 817 2,074 1,645
Balance at end of period (76,183) (73,641) (76,183) (73,641)
Accumulated Defined Benefit Plans Adjustment | OPEB        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (670) (620) (590) (550)
Other comprehensive income (loss) (71) (65) (151) (135)
Balance at end of period (741) (685) (741) (685)
Accumulated other comprehensive income (loss)        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (260,845) (247,537) (251,690) (248,270)
Other comprehensive income (loss) 5,324 2,472 (3,831) 3,205
Balance at end of period $ (255,521) $ (245,065) $ (255,521) $ (245,065)